Passenger cabin air control systems and methods

ABSTRACT

A vehicle system includes: at least one of: a particulate matter sensor configured to measure an amount of particulate within a passenger cabin of a vehicle; and a volatile organic compounds (VOC) sensor configured to measure an amount of VOCs within the passenger cabin of the vehicle; and a heating, ventilation, and air conditioning (HVAC) system including a blower; a blower control module configured to: operate the blower in a first direction and blow air into the passenger cabin of the vehicle; and based on at least one of the amount of particulate and the amount of VOCs within the passenger cabin of the vehicle, selectively operate the blower in a second direction that is opposite the first direction, thereby blowing air from within the passenger cabin out through the HVAC system.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No. 63/067,907, filed on Aug. 20, 2021. The entire disclosure of the application referenced above is incorporated herein by reference.

FIELD

The present disclosure relates to vehicles and more particularly to systems and methods for controlling airflow out of a passenger cabin of a vehicle.

BACKGROUND

This section provides background information related to the present disclosure which is not necessarily prior art.

Vehicles have been recalled due to carbon monoxide entering their passenger cabins and for other reasons. Humans may be overcome by carbon monoxide and lose consciousness.

There may be numerous other situations where chemicals could be present within a passenger cabin of a vehicle. For example, a user may bring an aerosol can in to the passenger cabin of a vehicle and forget to take it out. Due to heat or cold, the aerosol can could emit its contents into the passenger cabin. One or more users could enter the vehicle later and breathe the contents without knowledge.

Electric vehicles include one or more batteries that contain chemicals, such as lithium. The batteries may be located under the passenger cabin and, under some circumstances, can rupture and emit chemicals. Some chemicals that may be present within a passenger cabin of a vehicle may be odorless and colorless.

SUMMARY

In a feature, a vehicle system includes: at least one of: a particulate matter sensor configured to measure an amount of particulate within a passenger cabin of a vehicle; and a volatile organic compounds (VOC) sensor configured to measure an amount of VOCs within the passenger cabin of the vehicle; and a heating, ventilation, and air conditioning (HVAC) system including a blower; a blower control module configured to: operate the blower in a first direction and blow air into the passenger cabin of the vehicle; and based on at least one of the amount of particulate and the amount of VOCs within the passenger cabin of the vehicle, selectively operate the blower in a second direction that is opposite the first direction, thereby blowing air from within the passenger cabin out through the HVAC system.

In further features, the blower control module is further configured to selectively at least one of increase and decrease a speed of the blower in at least one of the first direction and the second direction.

In further features, the blower control module is configured to operate the blower in the second direction in response to a determination that at least one of: the amount of particulate within the passenger cabin is greater than a predetermined amount of particulate; and the amount of VOCs within the passenger cabin is greater than a predetermined amount of VOCs.

In further features, a window actuator module is configured to, based on at least one of the amount of particulate and the amount of VOCs within the passenger cabin of the vehicle, selectively open at least one window of the vehicle.

In further features, the window actuator module is configured to, open the at least one window of the vehicle in response to a determination that at least one of: the amount of particulate within the passenger cabin is greater than a predetermined amount of particulate; and the amount of VOCs within the passenger cabin is greater than a predetermined amount of VOCs.

In further features, a door actuator module is configured to: during operation of the blower in the first direction, actuate a purge door to a first position to draw air through an air filter in a first direction; and during operation of the blower in the second direction, maintain the purge door to in the first position to push air through the air filter in a second direction that is opposite the first direction.

In further features, a door actuator module is configured to: during operation of the blower in the first direction, actuate a purge door to a first position to draw air through an air filter in a first direction; and during operation of the blower in the second direction, actuate the purge door to a second position to: block airflow through the air filter; and flow air through an outlet to outside of the passenger cabin of the vehicle.

In further features, the outlet is fluidly connected to an engine compartment of the vehicle.

In further features, the outlet is fluidly connected to an air intake system of an engine of the vehicle.

In further features, the door actuator module is further configured to, during operation of the blower in the second direction, open a vent door configured to allow fresh air to flow into a duct of the HVAC system and into the passenger cabin.

In further features, the blower control module is configured to: operate the blower in the first direction by applying power of a first polarity to an electric motor of the blower; and operate the blower in the second direction by applying power of a second polarity to the electric motor of the blower.

In further features, a condensate sensor is configured to measure an amount of liquid at a location within the HVAC system, where the blower control module is configured to, when the amount measured by the condensate sensor is greater than a predetermined amount, disable operation of the blower in the second direction.

In further features: a condensate sensor is configured to measure an amount of liquid at a location within the HVAC system; and a compressor control module is configured to disable operation of a compressor of the HVAC system when the amount measured by the condensate sensor is greater than a predetermined amount.

In a feature, a method includes: at least one of: measuring an amount of particulate within a passenger cabin of a vehicle; and measuring an amount of volatile organic compounds (VOCs) within the passenger cabin of the vehicle; and operating a blower of a heating, ventilation, and air conditioning (HVAC) system in a first direction and blowing air into the passenger cabin of the vehicle; and based on at least one of the amount of particulate and the amount of VOCs within the passenger cabin of the vehicle, selectively operating the blower in a second direction that is opposite the first direction, thereby blowing air from within the passenger cabin out through the HVAC system.

In further features, the method further includes selectively at least one of increasing and decreasing a speed of the blower in at least one of the first direction and the second direction.

In further features, selectively operating the blower in the second direction includes operating the blower in the second direction in response to a determination that at least one of: the amount of particulate within the passenger cabin is greater than a predetermined amount of particulate; and the amount of VOCs within the passenger cabin is greater than a predetermined amount of VOCs.

In further features, the method further includes, based on at least one of the amount of particulate and the amount of VOCs within the passenger cabin of the vehicle, selectively opening at least one window of the vehicle.

In further features, the selectively opening includes opening the at least one window of the vehicle in response to a determination that at least one of: the amount of particulate within the passenger cabin is greater than a predetermined amount of particulate; and the amount of VOCs within the passenger cabin is greater than a predetermined amount of VOCs.

In further features, the method further includes: during operation of the blower in the first direction, actuating a purge door to a first position to draw air through an air filter in a first direction; and during operation of the blower in the second direction, maintaining the purge door to in the first position to push air through the air filter in a second direction that is opposite the first direction.

In further features, the method further includes: during operation of the blower in the first direction, actuating a purge door to a first position to draw air through an air filter in a first direction; and during operation of the blower in the second direction, actuating the purge door to a second position to: block airflow through the air filter; and flow air through an outlet to outside of the passenger cabin of the vehicle.

Further areas of applicability of the present disclosure will become apparent from the detailed description, the claims and the drawings. The detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the disclosure.

DRAWINGS

The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

FIG. 1 is a functional block diagram of an example vehicle system.

FIG. 2 is a diagram of an example heating, ventilation, and air conditioning (HVAC) system of a vehicle.

FIGS. 3 and 4 are diagrams of example HVAC systems configured to pump air out of a passenger cabin of a vehicle.

FIG. 5 is a functional block diagram of an example control system.

FIG. 6 is a flowchart depicting an example method of selectively taking remedial action based on one or more amounts of one or more chemicals within a passenger cabin of a vehicle.

Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.

DETAILED DESCRIPTION

Example embodiments will now be described more fully with reference to the accompanying drawings.

A blower of a heating, ventilation, and air conditioning (HVAC) system of a vehicle may operate in one direction as to blow air into a passenger cabin of the vehicle. The blower may operate in the first direction, for example, to recirculate air, blow cool air, or blow warm air into the passenger cabin.

The present application involves operating the blower in a second direction that is opposite the first direction to pump air out of the passenger cabin, such as when an amount of a chemical within the passenger cabin is greater than a predetermined value. This may reduce the amount of the chemical within the passenger cabin, increasing breathability and smell of the air within the passenger cabin.

FIG. 1 includes a functional block diagram including an example vehicle 5. The vehicle 5 includes a control module 8 and one or more olfaction sensors, such as olfaction sensor 10. Examples of olfaction sensors in vehicles include, for example, particulate matter sensors, carbon monoxide (or other carbon oxide) sensors, volatile organic compound (VOC) sensors, and other types of sensors. The vehicle 5 may include one or more different types of olfaction sensors.

The olfaction sensor(s) are each configured to measure an amount of one or more chemicals within a passenger cabin of the vehicle 5. For example, the vehicle 5 may include a particulate matter sensor configured to measure one or more amounts (e.g., concentrations or mass flow rates) of particulate of one or more different sizes in air within the passenger cabin. Additionally or alternatively, the vehicle 5 may include a carbon monoxide sensor configured to measure an amount (e.g., concentration) of carbon monoxide in air within the passenger cabin. Additionally or alternatively, the vehicle 5 may include a VOC sensor configured to measure an amount (e.g., concentration) of VOCs within the passenger cabin.

The control module 8 may receive the measurements from the olfaction sensor(s) and take one or more remedial actions based on the measurements. For example, when one or more amount of one or more chemicals (e.g., particulate, carbon monoxide, VOCs) measured by one or more olfaction sensors is/are greater than one or more respective predetermined amount/s (e.g., of particulate matter, carbon monoxide, or VOCs, respectively), the control module 8 may take one or more remedial actions. The predetermined amount/s is/are greater than zero.

For example, the control module 8 may open one or more windows 12 of the vehicle 5 when the amount of a chemical is greater than the predetermined amount. Additionally or alternatively, the control module 8 may generate an alert within the vehicle 5 when the amount of a chemical is greater than the predetermined amount. For example, the control module 8 may generate or display a visual alert, such as via a visual indicator 14 that is visible within the passenger cabin of the vehicle 5. The visual indicator 14 may be, for example, one or more indicator lights, a display, or another suitable type of visual indicator. Additionally or alternatively, the control module 8 may output an audible alert, such as via one or more speakers. Additionally or alternatively, the control module 8 may output a tactile alert, such as via turning on one or more vibrating devices, such as located in one or more seats, in a steering wheel, or in another suitable location.

Additionally or alternatively, the control module 8 may turn on a heating ventilation and air conditioning (HVAC) system 16 of the vehicle 5 when the amount of a chemical is greater than the predetermined amount. The control module 8 may, for example, turn on a blower of the HVAC system 16 in a reverse direction and control one or more actuators of the HVAC system 16 to recirculate air from within the passenger cabin to outside of the passenger cabin. This is discussed in more detail below.

Additionally or alternatively, the control module 8 may store an indicator in memory of the vehicle when the amount of a chemical is greater than the predetermined amount. The indicator may indicate that the amount of the chemical was greater than the predetermined amount. The control module 8 may also store a time stamp (e.g., including a date and a time of the occurrence) with the indicator.

Additionally or alternatively, the control module 8 may transmit an indicator to a remote device 20, such as of a fleet operator, when the amount of a chemical is greater than the predetermined amount. The control module 8 may transmit the indicator via one or more communication networks, such as a cellular communication network, a satellite communication network, a Wi-Fi communication network, or another suitable type of communication network.

FIG. 2 is a diagram of an example HVAC system configured to flow air only into the passenger cabin of the vehicle. Flowing air into the passenger cabin of the vehicle 5 increases air pressure within the passenger cabin.

The HVAC system includes one or more duct openings 104 through which a blower 108 can blow air into the passenger cabin of the vehicle. One or more doors 112 (e.g., mode doors) may actuate to open and close ones of the duct openings 104. A blend door 116 may actuate and control whether the air from the blower 108 flows past/through a heater core 120 before flowing into the passenger cabin. When warm engine coolant is flowing through the heater core 120, the heater core 120 warms air flowing through/past the heater core 120.

The air also flows past/through an evaporator core 124 before flowing into the passenger cabin. When an air conditioning compressor (not shown) is pumping cool refrigerant through the evaporator core 124, the evaporator core 124 cools air flowing through/past the evaporator core 124. A drain 128 may be implemented downstream of the evaporator core 124 and allow condensation (e.g., from the evaporator core 124) to drain from the HVAC system.

In the example of FIG. 2, the blower 108 operates (e.g., rotates) in only one direction—to flow air into the passenger cabin. The blower 108 operates in that direction in response to the application of a first power (e.g., a first DC voltage or a first AC voltage) to the blower 108 by the control module 8. A recirculation door 136 actuates and controls whether the blower 108: (a) draws fresh air in from outside of the passenger cabin through a filter 144 via a first inlet 140; or (b) draws air from within the passenger cabin via a second inlet 148. When drawing air from within the passenger cabin via the second inlet 148, the HVAC system may be said to be operating in a recirculation mode.

FIGS. 3 and 4 are diagrams of an example HVAC system configured to pump air from within the passenger cabin out of the passenger cabin and to environment. Pumping air out of the passenger cabin is different than operating in the recirculation mode in that, during operation in the recirculation mode, the air that is drawn from the passenger cabin is recirculated back to the passenger cabin. Pumping air out of the passenger cabin decreases air pressure within the passenger cabin.

The control module 8 applies a second power (e.g., a second DC voltage, a second AC voltage, etc.) to a blower 208 to pump air out of the passenger cabin. The second power operates (e.g., rotates) the blower 208 in a second direction. Operation of the blower 208 in the second direction draws air from the passenger cabin.

The control module 8 may actuate purge door 212. The control module 8 may also actuate the other doors described herein. For example, the control module 8 may actuate the purge door 212 to a first state/position (216) to open an outlet 220 when operating the blower 208 in the second direction to pump air out from the passenger cabin to outside of the vehicle through the outlet 220. The outlet 220 may be, for example, to an engine compartment (a compartment within which an internal combustion engine of the vehicle is located) or to another suitable location. Outputting the air from the passenger cabin to the engine compartment may, for example, help mask any smell (e.g., marijuana smell) with engine smell (e.g., in the event of a traffic stop). The control module 8 may actuate the purge door 212 to a second position 224 when operating the blower 208 in the first direction.

As shown in FIG. 4, a vent door 304 may also be implemented. The control module 8 may open the vent door 304 to allow fresh air into the passenger cabin during operation of the blower 208 in the second direction while the purge door 212 is in the first state and air is being pumped out of the passenger cabin through the outlet 220. The vent door 304 may receive fresh air from outside of the passenger cabin when open. The vent door 304 may close the opening to fresh air when the vent door 304 is closed.

In various implementations, a condensate sensor 308 may measure an amount of liquid (e.g., condensation) in the drain pain. The control module 8 may turn off a compressor of the HVAC system and disable or not allow operation of the blower 208 in the second direction when the amount of liquid measured by the condensate sensor 308 is greater than a predetermined amount. Turning off the compressor may prevent further liquid generation. Preventing operation of the blower 208 in the second direction may prevent liquid (e.g., water) from being sucked back up through the drain.

In the examples of FIGS. 3 and 4, another drain (not shown) may be implemented between the evaporator core 124 and the blower 208 to drain condensation during operation of the blower 208 in the second direction. Additionally or alternatively, a drain pan (collector) may be disposed under the evaporator core 124 and be configured to direct collected condensation to one or more drains. The drain pan may extend a predetermined distance upstream and downstream of the evaporator core 124 to collect condensation that becomes airborne during operation of the blower 208. In various implementations, the drain(s) may include one way valves that allow condensation to be drained from the HVAC system 16 but do not allow air to flow into the HVAC system 16 during operation of the blower 208.

Described herein is a system and method for creating negative pressure inside the passenger cabin by reversing the HVAC flow (e.g., blower motor spinning in reverse) to generate negative pressure and draw air out of the passenger cabin. When operating the blower 208 in the second direction, the filter 144 may be bypassed and the air from the passenger cabin may be sent to environment via the outlet 220.

The control module 8 may operate the blower 208 in the second direction, for example, when the amount of a chemical within the passenger cabin measured by an olfaction sensor is greater than a predetermined amount. For example, the control module 8 may operate the blower 208 in the second direction (with the purge door 212 in the first state) when an amount of particulate matter measured by an olfaction sensor within the passenger cabin is greater than a predetermined amount. Additionally or alternatively, the control module 8 may operate the blower 208 in the second direction when an amount of VOCs measured by an olfaction sensor within the passenger cabin is greater than a predetermined amount. Additionally or alternatively, the control module 8 may operate the blower 208 in the second direction when an amount of carbon monoxide measured by an olfaction sensor within the passenger cabin is greater than a predetermined amount.

In various implementations, the control module 8 may operate the blower 208 in the second direction with the purge door 212 in the second state. This may force air from the passenger cabin through the filter 144 in the opposite direction that air normally flows through the filter 144, for example, to clean/blow out the filter 144. This may increase a life of the filter 144.

Pumping air from the passenger cabin through the outlet 220 may be a more effective way of pumping air out of the passenger cabin by bypassing the filter 144 and actively removing the air from the passenger cabin instead of trying to mix in new/fresh air.

In various implementations, the outlet 220 may be fluidly connected to an intake system of the engine. With this arrangement, air (and any chemicals present) from within the passenger cabin can be combusted within the engine via operation of the blower 208 in the second direction.

When (e.g., tobacco) smoking occurs within the passenger cabin, the smell of the smoking may linger. When the control module 8 detects smoking or that smoking has occurred within the passenger cabin (e.g., using an olfaction sensor), the control module 8 may operate the blower 208 in the second direction to evacuate air (including the smoke or smoke smell) to outside of the passenger cabin. Alternatively, when the control module 8 detects smoking or that smoking has occurred within the passenger cabin (e.g., using an olfaction sensor), the control module 8 may operate the blower 208 in the first direction with the purge door 212 in the second state to increase fresh airflow into the passenger cabin.

In various implementations, the control module 8 may monitor the measurement(s) from the olfaction sensor(s). The control module 8 may determine a baseline within the passenger cabin based on the measurements, for example, an average of the measurements taken over a predetermined period. The control module 8 may determine a baseline for each different type of chemical measured. The baselines reflect the normal smell within the passenger cabin. The control module 8 may operate the blower 208 in the first direction or the second direction, as described above, when a measurement is greater than the associated baseline. This may help reduce the measurement such that the baseline does not increase over time or increases more slowly.

If a measurement remains above its baseline after an ignition (key) cycle is complete, the control module 8 may operate the blower 208 in the first direction or the second direction, as discussed above, starting when a next ignition cycle begins. In addition to decreasing the smell during the next ignition cycle, this may help prevent the baseline from increasing or help the baseline increase more slowly.

By operating the blower 208 and controlling the purge door 212 as described above, the control module 8 brings air quality within the passenger cabin back to the baselines or within a predetermined percentage (or amount) of the baselines.

In various implementations, the control module 8 may open one or more of the windows 12 when smoking is detected within the passenger cabin (e.g., using one or more measurements from one or more olfaction sensors). The control module 8 may determine which of the windows 12 to open based on the seat where the smoking is occurring. For example, when the control module 8 detects smoking in a driver's seat of the vehicle, the control module 8 may open a rear window located on a driver's side (and possibly a passenger side rear window) of the vehicle 5. This may draw the fresh air toward where the smoking is occurring, and draw the smoke from the smoking toward/to the HVAC system 16 to be pumped out to environment.

In various implementations, the vehicle 5 may include an input (e.g., button, switch, touchscreen display, etc.) that can be used to trigger pumping air from within the passenger cabin to environment. For example, in response to receipt of user input via the input, the control module 8 may operate the blower 208 as described above.

In various implementations, the control module 8 may selectively at least one of increase and decrease a speed of the blower 208 during operation (in the first direction or the second direction) to change a volume of air moved.

FIG. 5 is a functional block diagram of an example implementation of a control system. As discussed above, one or more olfaction sensors may be included, such as at least one of a VOC sensor, a particulate matter sensor, and a carbon monoxide sensor. The olfaction sensor 10 of FIG. 5 may be a VOC sensor, a particulate matter sensor, or a carbon monoxide sensor. In various implementations, the olfaction sensor 10 may include two or more of a VOC sensor, a particulate matter sensor, and a carbon monoxide sensor.

A comparison module 504 compares a measurement from the olfaction sensor 10 with a predetermined value and generates an output signal based on the comparison. The measurement may be, for example, an amount of particulate, an amount of VOCs, or an amount of carbon monoxide. The comparison module 504 may set the output signal to the first state when the measurement is less than the predetermined value and set the output signal to a second state when the measurement is greater than or equal to the predetermined value.

The comparison module 504 may obtain the predetermined value from memory 508. The predetermined value may be a fixed predetermined value that is greater than zero. Alternatively, the predetermined value may be variable. For example, a baseline module 512 may determine a baseline value and set the predetermined value to the baseline value. The baseline module 512 may set the baseline value, for example, based or equal to an average of the measurements from the olfaction sensor 10 taken over a predetermined period, such as a week or a month. An average may be determined by summing the measurements and dividing by the number of measurements summed.

One or more remedial actions may be taken when the output signal of the comparison module 504 is in the second state. For example, a window actuator module 516 controls actuation (opening and closing) of one or more window actuators, such as window actuator 520, of the vehicle. The window actuator 520 opens (e.g., lowers) and closes (e.g., raises) a window of the vehicle. The window actuator module 516 may control one or more window actuators to open one, more than one, or all of the windows of the vehicle when the output signal of the comparison module 504 is in the second state. Opening the window(s) may include, for example, opening the window(s) to a partially open position further than the window(s) is/are presently open or opening the window(s) to a fully open position.

Additionally or alternatively, an alert module 524 may generate an alert (e.g., visually the visual indicator 14, audibly via one or more speakers, and/or haptically via one or more vibrating devices) when the output signal of the comparison module 504 is in the second state. Additionally or alternatively, a blower control module 528 may operate the blower 208 of the HVAC system in the second (reverse) direction when the output signal of the comparison module 504 is in the second state. This may pump air from within the passenger cabin out of the passenger cabin. The blower control module 528 may operate the blower 208 in the second direction by reversing a polarity of power applied to (an electric motor of) the blower 208.

Additionally or alternatively, a door actuator module 536 may actuate one or more doors of the HVAC system when the output signal of the comparison module 504 is in the second state. For example, the door actuator module 536 may actuate the recirculation door 136 such the recirculation door 136 blocks airflow from the blower 208 to the second inlet 148 and actuate the purge door 212 to the first position 216 to open the outlet 220 and to pump air out from the passenger cabin to outside of the vehicle through the outlet 220. This is shown in the example of FIG. 3. Additionally, the door actuator module 536 may open the vent door 304, such as shown in the example of FIG. 4, to allow fresh air into the passenger cabin.

Additionally or alternatively, a communication module 540 may wirelessly transmit an indicator to the remote device 20 via one or more antennas 544 when the output signal of the comparison module 504 is in the second state. Additionally or alternatively, a storage module 548 may store an indicator in the memory 508 when the output signal of the comparison module 504 is in the second state. The indicator may indicate that the amount of the chemical was greater than the predetermined value. The storage module 548 may also store a time stamp (e.g., including a date and a time of the occurrence) with the indicator. A clock 552 may track the date and time.

A compressor control module 560 may control operation of a compressor 564 of the HVAC system. The HVAC system can be used to cool the passenger cabin when the compressor 564 is on.

The compressor control module 560 may turn off or disable the compressor 564 when the amount of liquid measured by the condensate sensor 308 is greater than a predetermined amount. The condensate sensor 308 may, for example, measure a level of liquid within the drain pain. The predetermined amount may correspond to or be a predetermined level. The predetermined amount is calibratable and is greater than zero. When the amount measured by the condensate sensor 308 is greater than the predetermined amount, the blower control module 528 may also turn off the blower 208 if the blower 208 is operating in the second direction or not operate the blower 208 in the second direction, regardless of the output of the comparison module 504.

FIG. 6 is a flowchart depicting an example method of selectively taking remedial action based on one or more amounts of one or more chemicals within a passenger cabin of a vehicle. Control begins with 604 where the comparison module 504 receives a measured amount of a chemical from the olfaction sensor 10. At 608, the comparison module 504 determines whether the measurement from the olfaction sensor 10 is less than the predetermined value. If 608 is false, the comparison module 504 sets the output signal to the second state at 612, and control continues with 620. If 608 is true, the comparison module 504 sets the output signal to the first state at 616, and control continues with 620.

At 620, one or more of the window actuator module 516, the alert module 524, the blower control module 528, the door actuator module 536, the communication module 540, and the storage module 548 determine whether the output signal is in the second state. If 620 is false, no remedial action is taken at 624, and control may end. If 620 is true, one or more remedial actions are taken at 628, as discussed above. For example, at least one of: the window actuator module 516 may open one or more windows; the alert module 524 may generate one or more alerts; the storage module 548 may store one or more indicators; and the communication module 540 may transmit one or more indicators to the remote device 20. Additionally or alternatively, at least one of: the blower control module 528 may operate the blower 208 in the second (reverse) direction; the door actuator module 536 may actuate the purge door 212 to the first position 216; the door actuator module 536 may actuate the purge door 212 to the second position 224; and the door actuator module 536 may open the vent door 304. While the example of FIG. 6 is shown as ending, control may return to 604.

The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

In this application, including the definitions below, the terms “module” and “system” may refer to, be part of, or include circuits or circuitry that may include processor hardware (shared, dedicated, or group) that executes code and memory hardware (shared, dedicated, or group) that stores code executed by the processor hardware. The code is configured to provide the features of the modules and systems described herein. In addition, in this application the terms “module” and “system” may be replaced with the term “circuit.” The term “memory hardware” may be a subset of the term computer-readable medium. The term computer-readable medium does not encompass transitory electrical and electromagnetic signals propagating through a medium, and may therefore be considered tangible and non-transitory. Non-limiting examples of a non-transitory tangible computer readable medium include nonvolatile memory, volatile memory, magnetic storage, and optical storage.

The apparatuses and methods described in this application may be partially or fully implemented by a special purpose computer created by configuring a general purpose computer to execute one or more particular functions embodied in computer programs. The functional blocks, flowchart components, and other elements described above serve as software specifications, which can be translated into the computer programs by the routine work of a skilled technician or programmer.

The computer programs include processor-executable instructions that are stored on at least one non-transitory, tangible computer-readable medium. The computer programs may also include or rely on stored data. The computer programs may encompass a basic input/output system (BIOS) that interacts with hardware of the special purpose computer, device drivers that interact with particular devices of the special purpose computer, one or more operating systems, user applications, background services, background applications, etc.

The computer programs may include: (i) descriptive text to be parsed, such as JavaScript Object Notation (JSON), hypertext markup language (HTML) or extensible markup language (XML); (ii) assembly code; (iii) object code generated from source code by a compiler; (iv) source code for execution by an interpreter; (v) source code for compilation and execution by a just-in-time compiler, etc. As examples only, source code may be written using syntax from languages including C, C++, C #, Objective C, Haskell, Go, SQL, R, Lisp, Java®, Fortran, Perl, Pascal, Curl, OCaml, Javascript®, HTML5, Ada, ASP (active server pages), PHP, Scala, Eiffel, Smalltalk, Erlang, Ruby, Flash®, Visual Basic®, Lua, and Python®.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.

When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. 

What is claimed is:
 1. A vehicle system, comprising: at least one of: a particulate matter sensor configured to measure an amount of particulate within a passenger cabin of a vehicle; and a volatile organic compounds (VOC) sensor configured to measure an amount of VOCs within the passenger cabin of the vehicle; and a heating, ventilation, and air conditioning (HVAC) system including a blower; a blower control module configured to: operate the blower in a first direction and blow air into the passenger cabin of the vehicle; and based on at least one of the amount of particulate and the amount of VOCs within the passenger cabin of the vehicle, selectively operate the blower in a second direction that is opposite the first direction, thereby blowing air from within the passenger cabin out through the HVAC system.
 2. The vehicle system of claim 1 wherein the blower control module is further configured to selectively at least one of increase and decrease a speed of the blower in at least one of the first direction and the second direction.
 3. The vehicle system of claim 2 wherein the blower control module is configured to operate the blower in the second direction in response to a determination that at least one of: the amount of particulate within the passenger cabin is greater than a predetermined amount of particulate; and the amount of VOCs within the passenger cabin is greater than a predetermined amount of VOCs.
 4. The vehicle system of claim 1 further comprising a window actuator module configured to, based on at least one of the amount of particulate and the amount of VOCs within the passenger cabin of the vehicle, selectively open at least one window of the vehicle.
 5. The vehicle system of claim 4 wherein the window actuator module is configured to, open the at least one window of the vehicle in response to a determination that at least one of: the amount of particulate within the passenger cabin is greater than a predetermined amount of particulate; and the amount of VOCs within the passenger cabin is greater than a predetermined amount of VOCs.
 6. The vehicle system of claim 1 further comprising a door actuator module configured to: during operation of the blower in the first direction, actuate a purge door to a first position to draw air through an air filter in a first direction; and during operation of the blower in the second direction, maintain the purge door to in the first position to push air through the air filter in a second direction that is opposite the first direction.
 7. The vehicle system of claim 1 further comprising a door actuator module configured to: during operation of the blower in the first direction, actuate a purge door to a first position to draw air through an air filter in a first direction; and during operation of the blower in the second direction, actuate the purge door to a second position to: block airflow through the air filter; and flow air through an outlet to outside of the passenger cabin of the vehicle.
 8. The vehicle system of claim 7 wherein the outlet is fluidly connected to an engine compartment of the vehicle.
 9. The vehicle system of claim 7 wherein the outlet is fluidly connected to an air intake system of an engine of the vehicle.
 10. The vehicle system of claim 7 wherein the door actuator module is further configured to, during operation of the blower in the second direction, open a vent door configured to allow fresh air to flow into a duct of the HVAC system and into the passenger cabin.
 11. The vehicle system of claim 1 wherein the blower control module is configured to: operate the blower in the first direction by applying power of a first polarity to an electric motor of the blower; and operate the blower in the second direction by applying power of a second polarity to the electric motor of the blower.
 12. The vehicle system of claim 1 further comprising a condensate sensor configured to measure an amount of liquid at a location within the HVAC system, wherein the blower control module is configured to, when the amount measured by the condensate sensor is greater than a predetermined amount, disable operation of the blower in the second direction.
 13. The vehicle system of claim 1 further comprising: a condensate sensor configured to measure an amount of liquid at a location within the HVAC system; and a compressor control module configured to disable operation of a compressor of the HVAC system when the amount measured by the condensate sensor is greater than a predetermined amount.
 14. A method, comprising: at least one of: measuring an amount of particulate within a passenger cabin of a vehicle; and measuring an amount of volatile organic compounds (VOCs) within the passenger cabin of the vehicle; and operating a blower of a heating, ventilation, and air conditioning (HVAC) system in a first direction and blowing air into the passenger cabin of the vehicle; and based on at least one of the amount of particulate and the amount of VOCs within the passenger cabin of the vehicle, selectively operating the blower in a second direction that is opposite the first direction, thereby blowing air from within the passenger cabin out through the HVAC system.
 15. The method of claim 14 further comprising selectively at least one of increasing and decreasing a speed of the blower in at least one of the first direction and the second direction.
 16. The method of claim 15 wherein selectively operating the blower in the second direction includes operating the blower in the second direction in response to a determination that at least one of: the amount of particulate within the passenger cabin is greater than a predetermined amount of particulate; and the amount of VOCs within the passenger cabin is greater than a predetermined amount of VOCs.
 17. The method of claim 14 further comprising based on at least one of the amount of particulate and the amount of VOCs within the passenger cabin of the vehicle, selectively opening at least one window of the vehicle.
 18. The method of claim 17 wherein the selectively opening includes opening the at least one window of the vehicle in response to a determination that at least one of: the amount of particulate within the passenger cabin is greater than a predetermined amount of particulate; and the amount of VOCs within the passenger cabin is greater than a predetermined amount of VOCs.
 19. The method of claim 14 further comprising: during operation of the blower in the first direction, actuating a purge door to a first position to draw air through an air filter in a first direction; and during operation of the blower in the second direction, maintaining the purge door to in the first position to push air through the air filter in a second direction that is opposite the first direction.
 20. The method of claim 14 further comprising: during operation of the blower in the first direction, actuating a purge door to a first position to draw air through an air filter in a first direction; and during operation of the blower in the second direction, actuating the purge door to a second position to: block airflow through the air filter; and flow air through an outlet to outside of the passenger cabin of the vehicle. 